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提出了一种用二阶灵敏度修改结构固有频率 (特征值 )的算法 ,修改量是结构的设计参数 .引入二阶灵敏度主要是为了提高估计精度 ,通过非线性优化方法求解满足给定特征值要求的设计参数的变化量 .数值算例表明 ,所提出的算法在特征值修改量达到 2 0 0 %时仍有满意的精度和收敛性
An algorithm to modify the structure natural frequency (eigenvalue) with second-order sensitivity is proposed, in which the modified quantity is the design parameter of the structure.The second-order sensitivity is introduced to improve the estimation accuracy and the non-linear optimization method is used to solve the given eigenvalue The numerical results show that the proposed algorithm still has satisfactory accuracy and convergence when the eigenvalue modification reaches 200%